#include <bits/stdc++.h>
using namespace std;

int main() {
  long long a, b, c, d;
  cin >> a >> b >> c >> d;
  long long D = (a - c) * (a - c) - 4 * 2 * (b - d);
  if (D < 0) {
    cout << "No" << endl;
  } else if (D == 0) {
    cout << "Yes" << endl;
  } else {
    cout << fixed << (a + c) / 2.0 << ' ' << (b + d) / 2.0 << endl;
  }
}